fix: Handle local package database errors better (#8)

* Handle local package database errors better

If a 'local' package doesn't exist, we can just not count it.

* Better handling of missing local packages

src/metrics/databaseMetrics.ts

@@ -35,7 +35,13 @@ async function* iterateLocalDatabase(
   // do the async fetching loop
   const packageList = await getPkgList();
   for (const packageName of packageList) {
-    const packageMeta = await getPkgMetadata(packageName);
+    // handle missing packages: https://github.com/freight-hub/verdaccio-openmetrics/issues/7
+    const packageMeta = await getPkgMetadata(packageName).catch(err => {
+      const reason = (err as Error).message || `${err}`;
+      // eslint-disable-next-line no-console
+      console.error(`WARN: Failed to fetch local package "${packageName}" for database metrics: ${reason}`);
+      return null;
+    });
     if (packageMeta) {
       yield packageMeta;
     }